Yomika is the protagonist of Yume Graffiti, she seems to either be in earlier times, or in an obscure part of a jungle.
Appearance
Yomika has dark purple-blue hair, half of which covers her left eye. She seems to wear a sort of leaf-skirt, possibly handmade, along with a green shirt with a zig-zag design on it.
Personality
Yomika is often portrayed as a lone-wolf-kind of character, due to the emptiness of her dreams, along with a lack of organic-like characters.
Past
It's difficult to know when does the events happen due to the anachronism shown on the dreams: cities with a subway appear amongst traditional myths (Tengu effect's location, for example). Due to an effect location (Violin), it is quite possible that Yomika has been abused in the past.